Threadline treating apparatus

ABSTRACT

An enclosure surrounds a jet device for fluid treating a threadline passing through the enclosure. The jet device has a curved surface positioned with respect to the threadline, the stream-forming orifice of the jet and a wall of the enclosure to divert the treating fluid traveling along the threadline away from the threadline and redirect it across the threadline near the threadline passage openings in the enclosure.

United States Patent lnvcntor Louis Gray Cannon Grifton, N.C.

Appl. No. 841,441

Filed July 14, 1969 Patented Apr. 13, 1971 Assignee E. l. duPont de Nemours 8: Company Wilmington, Del.

THREADLINE TREATING APPARATUS 4 Claims, 2 Drawing Figs.

US. Cl 28/l.4, 28/72. 1 2

Int. Cl D02g 3/00 Field of Search 28/ l .4,

[56] References Cited UNITED STATES PATENTS 2,631,385 3/1953 Kinraide 34/242 3,103,731 9/1963 Salyer et al.. 28/l .4 3,324,526 6/1967 Bums et al 28/ l .4

Primary ExaminerMervin Stein Assistant ExaminerLeo Millstein Att0rney-Howard P. West, Jr.

ABSTRACT: An enclosure surrounds a jet device for fluid treating a threadline passing through the enclosure. The jet device has a curved surface positioned with respect to the threadline, the stream-forming orifice of the jet and a wall of the enclosure to divert the treating fluid traveling along the threadline away from the threadline and redirect it across the threadline near the threadline passage openings in the enclosure.

THREADLINE TREATING APPARATUS BACKGROUND OF THE INVENTION This invention concerns apparatus for confining a fluid stream within an enclosure having openings for the entry and exit of moving threadlines by diverting the stream away from the openings and redirecting the stream across the threadline at or near 90 to the threadline near an opening and then toward an enclosure exhaust.

High velocity streamswhich are used for treating textile yarn frequently contain liquid droplets, heat or fumes. It is usually desirable to prevent such streams from blowing onto machinery parts or into the room atmosphere where the materials may corrode the machinery or produce undesirable working conditions. One means of enclosing such a stream and removing it to an exhaust duct is disclosed by Salyer et al. in US. Pat. No 3,103,731 where moisture-laden streams issue from the device in straight lines toward collecting baffles which turn the streams toward an exhaust while the yarn line is bent in a different direction from the streams. Fluid streams have also been diverted away from a straight threadline to a collecting system by means of a Coanda surface, as disclosed by Kinraide in US, Pat. No. 2,63l,385, wherein fluid issuing with a threadline from a pressurized chamber is turned away from the threadline to a collector. It has now been found that such streams may be diverted toward an exhaust in a surprising manner which actually increases the efficiency of the collection and requires less exhaust capacity.

SUMMARY OF THE INVENTION This invention concerns a device for fluid treatment of a threadline surrounded by an enclosure having openings for entry and/or exit of a threadline being forwarded in a substantially straight path wherein the enclosure is maintained under a pressure less than ambient. A jet of fluid, which may consist of or contain liquid, is initially directed approximately perpendicular to the threadline and against a backing plate which divides the stream into components parallel to the threadline in the upstream and downstream directions. A stream is then diverted away from the threadline by providing a curved surface to which the flowing stream attaches itself by the Coanda Effect. At least a portion of the stream is subsequently diverted back across the threadline at a substantial angle to the threadline approaching 90 so that the airflow within the enclosure near the enclosure opening is substantially parallel to the enclosure wall. Since the pressure of a flowing stream is inversely related to the velocity, the streams flowing across the openings inside the enclosure may actually aspirate outside air and aid the action of the exhaust in maintaining a flow of ambient air inward through the opening.

BRIEF DESCRIPTION OF THE DRAWING along the line W-W. shown with the door closed.

DETAILED DESCRIPTION OF THE PREFERRED I EMBODIMENT Referring to the drawing a typical threadline 1 passes in contact with guide pins 2 and 3 into entry slot 4 of enclosure support 5. The enclosure assembly is shown with hinged door 6 in the open position. When door 6 is closed the enclosure assembly forms a chamber 14 (FIG. 2) having upper, lower, front and back walls designated 19, 23, 25, 27 respectively. The threadline 1 next passes between jet body 7 attached to wall 27 and backing plate 8 attached to jet 7, then between guide pins 9 and 10, and out of the enclosure through exit slot 11 and over guide pin 12. A pressure less than ambient is maintained within chamber 14 by exhausting the chamber through pipe 13 which is in communication with the chamber and the suction side of a blower or other such device.

LII

Compressed air enters jet 7 through supply pipe I6 and exits through stream-forming orifice 17. After impinging on the yarn l and backing plate 8, the airstream separates and leaves the impingement region chiefly in two streams parallel to the threadline, one upstream and one downstream. In the device of this invention, curved Coanda surface 18 turns the stream of air toward the rear wall 27 of the chamber 14 where a portion of the stream is channeled toward the exhaust 13 through the space between jet 7 and the upper wall 19. Surprisingly, however, this confined configuration redirects a major portion of the flow parallel to wall 19 toward the door 6 at a direction approximately 90 to the threadline, past entrance slot 4. The curved surfaces 29, 31 of the door direct a substantial portion of the airflow downward past the bracket which supports guide pin and across the threadline at approximately 90 near exit slot 11 toward channel 20. As the airstream separates filaments and interlaees them, the violent action removes wet finish from the yarn and carries finish particles along with it. When the airflow is forced to turn suddenly, as at the back edge of the Coanda surface and at other points, the liquid particles tend to deposit on the enclosure walls and to drain down toward channel 20. The liquid then flows along channel 20' to exhaust I3.

While jet 7 is shown with only one Coanda surface 18 sloping gradually upwardly and away from the threadline to substantially meet and terminate at the backwall 27, jet 7 may have a second Coanda surface similar to 18 on the downstream side, the downstream air current will then be diverted toward backwall 27 in the same manner as the upstream current where it will be largely redirected toward the door 6, crossing the threadline at approximately and will then join the downflowing current of air traveling downward around the housing of guidev pin 10 to channel 20. It should be noted that lip 22 of door 6 is designed so as to prevent liquid finish from flowing out exit slot 11. lnterlacing air flowing downstream is also deflected by guide pin 9 toward guide pin 10 and then back across the threadline and along surface 21 of the bracket holding guide pin 9. This surface is curved to act as a Coanda to deflect the airstream passing between the pins 9 and 10 toward channel 20.

The effectiveness of the upstream Coanda surface 18 is tested by measuring the direction and velocity of air flowing through entrance slot 4. Even with a flow of c.f.m. of air out of exhaust pipe 13, it was impossible to prevent finishladen air from escaping upward through the entrance slots when a jet without a Coanda surface was used. When a jet with Coanda surface of /;-inch radius was installed, a flow rate of L400 feet per minute inward through slot 4 was measured. The interlacing air pressure was 90 p.s.i.g. At a lower interlacing air pressure of 40 p.s.i.g., an inward airflow rate of 600 feet per minute could be maintained with only 55 c.f.m. flow through the exhaust when a Coanda was employed, whereas a jet without a Coanda operating at the same interlacing air pressure gave an outward flow of finish-laden air of 2,200 feet per minute. The Coanda surface radius may be as great as lAinches or more.

It should be noted that exhaust pipe 13 serves as additional set of four threadlines located symmetrically to the right of the exhaust centerline and, therefore, seems to be relatively inefficiently placed to have any direct effect on preventing the escape of mist-laden air from the enclosure. It is a surprising feature of the invention that by turning the airflow away from the direction of the threadline and redirecting it at right angles to the opening the velocity of the airflow is enabled to aid the exhaust section in improving the efficiency of the collection. If an exhaust duct is provided in the rear of the enclosure directly at the end of the Coanda surface, the mist-laden stream goes directly to the exhaust and there is no redirected stream flowing near the openings to provide an additional aspirating effect.

I claim:

1. An apparatus for reducing fluid flow from inlet and outlet ports in an enclosure through which a threadline passes in a substantially straight path for treatment in a fluid stream, said apparatus comprising the combination of an enclosure forming a chamber having upper, lower, front and backwalls, there being an exhaust port in communication with the chamber through the backwall and aligned inlet and outlet ports through the upper and lower walls respectively for passage of the threadline to and from a jet device mounted on said backwall, said jet device having a stream forming orifice and an opposed plate positioned on opposite sides of said path; means connected to said exhaust port for exhausting said chamber; means for supplying pressurized fluid to said jet; and a stream guiding member positioned adjacent said orifice, said member having a curved surface sloping gradually away from the threadline path toward said backwall.

2. The apparatus as defined in claim 1, said curved surface sloping gradually away from the central axis of the threadline in an upwardly direction.

3. The apparatus as defined in claim 2, the curvature of the curved surface being about to 1 /4 inch in radius.

4. An apparatus for reducing fluid flow from inlet and outlet ports in an enclosure through which a threadline passes in a substantially straight path for treatment in a fluid stream that is exhausted from the enclosure, said apparatus comprising: an enclosure forming a chamber having upper, lower, front and backwalls, there being an exhaust port in communication with the chamber through the lower portion of the backwall and aligned inlet and outlet ports through the upper and lower walls respectively for passage of the threadline to and from a jet device mounted on said backwall, said jet device having a stream-forming orifice and an opposed plate positioned on opposite sides of said path, the central axis of the orifice being perpendicular to said path, said plate having a surface in a plane perpendicular to said central axis; means connected to said exhaust port for maintaining a pressure less than ambient in said chamber; means for supplying pressurized fluid to said jet device, said jet device having a surface with a curvature of about iz-inch radius adjacent said orifice, said surface sloping gradually upwardly and away from the threadline to substantially meet and terminate at the backwall. 

1. An apparatus for reducing fluid flow from inlet and outlet ports in an enclosure through which a threadline passes in a substantially straight path for treatment in a fluid stream, said apparatus comprising the combination of an enclosure forming a chamber having upper, lower, front and backwalls, there being an exhaust port in communication with the chamber through the backwall and aligned inlet and outlet ports through the upper and lower walls respectively for passage of the threadline to and from a jet device mounted on said backwall, said jet device having a stream forming orifice and an opposed plate positioned on opposite sides of said path; means connected to said exhaust port for exhausting said chamber; means for supplying pressurized fluid to said jet; and a stream guiding member positioned adjacent said orifice, said member having a curved surface sloping gradually away from the threadline path toward said backwall.
 2. The apparatus as defined in claim 1, said curved surface sloping gradually away from the central axis of the threadline in an upwardly direction.
 3. The apparatus as defined in claim 2, the curvature of the curved surface being about 5/8 to 1 1/4 inch in radius.
 4. An apparatus for reducing fluid flow from inlet and outlet ports in an enclosure through which a threadline passes in a substantially straight path for treatment in a fluid stream that is exhausted from the enclosure, said apparatus comprising: an enclosure forming a chamber having upper, lower, front and backwalls, there being an exhaust port in communication with the chamber through the lower portion of the backwall and aligned inlet and outlet ports through the upper and lower walls respectively for passage of the threadline to and from a jet device mounted on said backwall, said jet device having a stream-forming orifice and an opposed plate positioned on opposite sides of said path, the central axis of the orifice being perpendicular to said path, said plate having a surface in a plane perpendicular to said central axis; means connected to said exhaust port for maintaining a pressure less than ambient in said chamber; means for supplying pressurized fluid to said jet device, said jet device having a surface with a curvature of about 5/8 -inch radius adjacent said orifice, said surface sloping gradually upwardly and away from the threadline to substantially meet and terminate at the backwall. 